Response.Redirect with try, catch, and finally Blocks and using Statements

Response.Redirect with try, catch, and finally Blocks and using Statements

The finally block executes after calls to Response.Redirect in the try block. Response.Redirect ultimately generates a ThreadAbortException exception. When this exception is raised, the runtime executes all finally blocks before ending the thread. However, because the finally block can do an unbounded computation or cancel the ThreadAbortException, the thread will not necessarily end. Therefore, before any redirection or transfer of processing can occur, you must dispose the objects. If your code must redirect, implement it in a way similar to the following code example.

String str;
SPSite oSPSite = null;
SPWeb oSPWeb = null;

try
{
 oSPSite = new SPSite("http://server");
 oSPWeb = oSPSite.OpenWeb(..);

 str = oSPWeb.Title;
 if(bDoRedirection)
 {
     if (oSPWeb != null)
        oSPWeb.Dispose();

     if (oSPSite != null)
        oSPSite.Dispose();

     Response.Redirect("newpage.aspx");
 }
}
catch(Exception e)
{
}
finally
{
 if (oSPWeb != null)
   oSPWeb.Dispose();

 if (oSPSite != null)
    oSPSite.Dispose();
}


Because a using statement instructs the run time to create a finally block,
whenever you use Response.Redirect within a using statement,
ensure that objects are disposed properly. The following code example shows how you can do this.

using (SPSite oSPSite = new SPSite("http://server"))
using (SPWeb oSPWeb = oSPSite.OpenWeb(..))
{
  if (bDoRedirection)
      Response.Redirect("newpage.aspx");
}